EP1304309A2 - Verfahren zum Herstellen eines mikromechanischen Bauelements mit einer beweglichen Struktur - Google Patents
Verfahren zum Herstellen eines mikromechanischen Bauelements mit einer beweglichen Struktur Download PDFInfo
- Publication number
- EP1304309A2 EP1304309A2 EP02022146A EP02022146A EP1304309A2 EP 1304309 A2 EP1304309 A2 EP 1304309A2 EP 02022146 A EP02022146 A EP 02022146A EP 02022146 A EP02022146 A EP 02022146A EP 1304309 A2 EP1304309 A2 EP 1304309A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- component
- layer
- recipient
- solvent
- movable structure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81C—PROCESSES OR APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OR TREATMENT OF MICROSTRUCTURAL DEVICES OR SYSTEMS
- B81C1/00—Manufacture or treatment of devices or systems in or on a substrate
- B81C1/00912—Treatments or methods for avoiding stiction of flexible or moving parts of MEMS
- B81C1/0092—For avoiding stiction during the manufacturing process of the device, e.g. during wet etching
- B81C1/00928—Eliminating or avoiding remaining moisture after the wet etch release of the movable structure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81C—PROCESSES OR APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OR TREATMENT OF MICROSTRUCTURAL DEVICES OR SYSTEMS
- B81C2201/00—Manufacture or treatment of microstructural devices or systems
- B81C2201/11—Treatments for avoiding stiction of elastic or moving parts of MEMS
- B81C2201/117—Using supercritical fluid, e.g. carbon dioxide, for removing sacrificial layers
Definitions
- the present invention relates to a method for Manufacture of a micromechanical component with a movable one Structure.
- the present invention is concerned with a Manufacturing process for a micromechanical component with a movable structure in which sticking of the movable structure on fixed areas of the micromechanical Component is prevented.
- SCPD Super critical point drier
- the acetone can be removed very well by CO 2 , whereupon the CO 2 in the "supercritical point dryer” is converted into the gaseous phase by simply raising the temperature beyond the critical temperature, as a result of which this process is dry, mobile Structures supplies.
- the use of such a process in a standard CMOS environment is not possible, since the structures and thus the wafers should not dry until they dry in the "supercritical point dryer", since otherwise they will already stick in the meantime (sticking) of the moving structures.
- DE 19506404 C1 describes a further method of manufacture a micromechanical component with a movable one Part known in which the sticking of the movable Partly on an adjacent surface can be prevented should.
- both the etching is carried out Structuring and separating the micromechanical component as well as the subsequent dehydration and drying in the same Container.
- the micromechanical component is in the Container rinsed with deionized water to contain the etchant completely remove, whereupon the container with acetone or ethanol is flushed through, then the acetone or ethanol is displaced by liquid carbon dioxide, in one final step of the container to a temperature value heated above the critical temperature of carbon dioxide to convert the carbon dioxide into the gaseous phase. Finally, the gaseous carbon dioxide from the Container drained slowly. Then the dried Component removed from the container.
- this technique is also in its field of application limited, since it must be prevented that the micromechanical Component between the etching step and the final one Step of evaporating the carbon dioxide dry otherwise their moving structure sticks. Consequently this known method is not suitable for production in a standard CMOS process.
- EP 0783107 A1 describes a manufacturing method for a known micromechanical component with a movable structure, to avoid sticking effects before Exposing the moving micromechanical structure in the way an etching process this via an auxiliary structure that consists of a There is photoresist, is fixed against the substrate, whereupon the movable structure through a further etching step is exposed. Finally, the photoresist fixation with the help of an O2 plasma or a dry etching process removed, making the structure flexible. Both are exothermic processes, so that this process too is subject to the same restrictions on which that too Known methods of D. Kabayashi et. al suffers.
- the present Invention Based on this prior art, the present Invention, the object of a method for manufacturing of a micromechanical component with a movable structure to create an embroidery of the movable structure at fixed areas of the component is avoided, although the process does not remove the limitations of manufacturing processes known process involves.
- the starting point of the method according to the invention is a preprocessed one micromechanical component in which a structure is embedded in a layer to be removed later.
- the embedded structure in a first process step partially exposed by an etching process the embedded structure to have a recess in the layer to generate, at least to the structure and to a fixed Area of the component, such as the substrate, zoom ranges.
- the remaining Layer at least in the area of the movable structure removed for example by means of an etching process, that the moving structure is only opposite from the paint the fixed area is fixed.
- this is to be processed Part inserted into a recipient.
- a solvent is in introduced the recipient to remove the varnish.
- a seventh step the recipient is over the critical temperature of the liquid is heated to this in to transfer the gaseous phase before in an eighth Process step the gas with the dissolved solvent the recipient is drained.
- Figure 1 shows a section of a near-surface area of a silicon substrate 1, on which a silicon dioxide layer 2 is arranged within which to in the course of Descriptive procedure to be exposed, later movable Structure 3 is embedded.
- the movable structure 3 is made usually made of polysilicon, but can also be made of others Materials exist.
- the silicon dioxide layer is one top layer 4 made of polysilicon covered.
- FIG Figure 2 illustrates a recess 6 by means of etching Process in the top layer 4 and the silicon dioxide layer 2 which generates the movable structure 3 partially exposed and up to a suitable fixed Area of the component, as in the exemplary embodiment Silicon substrate 1 extends.
- the shape of the recess is both isotropic and anisotropic Etching process into consideration.
- the process can open the openings in the Layer 4 even before the application of the photo mask 5 or Photoresist layer 7 may be formed.
- the dryer comprises 11 a pressure vessel cover part 12 and a pressure vessel bottom part 13, which together define a process space 14 within of which the silicon wafer structure 10 on adapted support areas 15, 16 is held.
- a pressure vessel bottom part 13 Inside the pressure vessel bottom part 13, an inlet 17 and an outlet 18 are formed.
- a baffle 19 At the end of the inlet 17 to the process space 14 is a baffle 19 arranged to the through the inlet 17 in the process room 14 to guide introduced media away from the silicon wafer structure 10.
- the structuring follows Opening 8 in the photoresist layer 7 at least continues part of the remaining layer 2 in the area of the movable Structure 3 such that the movable structure 3 opposite the silicon substrate 1 only through the photoresist structure 7 is fixed.
- This etching step can be done both before Introducing the component 9 into the dryer 11 as well as after the component 9 is introduced into the dryer 11, as far as the materials of the dryer 11 compared to those used Etching materials are resistant.
- a solvent is introduced into the process space 14 of the dryer 11, which serves to remove the lacquer 7.
- An organic solvent such as 2-propanol, is preferably used, which both detaches the photoresist and is itself soluble in CO 2 or a halogen-carbon compound.
- the process according to the invention is preferably carried out with CO 2 , which is supplied through the feed 17, until the organic solvent in the process space 14 has been completely displaced and dissolved.
- the inlet 17, the outlet 18 and a lid outlet opening 20 are closed before the temperature of the dryer 11 by heating-cooling plates 21, 22 on the top of the pressure vessel lid part 12 and the underside of the pressure vessel bottom part 13 to a value above the critical temperature for CO 2 , ie raised to a value above 30.98 degrees C.
- a halogen-carbon compound such as Freon (CClF 3 ) is used instead of CO 2 , the critical temperature is 29 degrees C.
- the initially liquid CO 2 is converted into its gaseous phase.
- the CO 2 gas is now slowly released through the lid outlet opening 20, whereupon after the dryer 11 has been opened, the finished silicon wafer structure 10 can be removed.
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Micromachines (AREA)
Abstract
Description
- 1
- Siliziumsubstrat
- 2
- Siliziumdioxidschicht
- 3
- Bewegliche Struktur
- 4
- Obere Schicht
- 5
- Fotomaske
- 6
- Ausnehmung
- 7
- Fotolackschicht
- 8
- Öffnung
- 9
- Bauteil
- 10
- Siliziumwaferstruktur
- 11
- Über-Kritischer-Punkt-Trockner
- 12
- Druckgefäßdeckelteil
- 13
- Druckgefäßbodenteil
- 14
- Prozessraum
- 15, 16
- Auflagebereich
- 17
- Zulauf
- 18
- Ablauf
- 19
- Prallblech
- 20
- Deckelauslaßöffnung
- 21, 22
- Heiz-Kühl-Platten
Claims (8)
- Verfahren zum Herstellen eines mikromechanischen Bauteils (9) mit einer beweglichen Struktur (3), mit folgenden Schritten:Bereitstellen des mikromechanischen Bauteils (9) mit einer in eine Schicht (2) eingebetteten Struktur (3);teilweise Freiligen der eingebetteten Struktur (3) durch Erzeugen einer an die Struktur und an einen feststehenden Bereich des Bauteils (9) heranreichenden Ausnehmung (6) in der Schicht (2);Fixieren der Struktur (3) gegenüber dem feststehenden Bereich des Bauteils (9) mittels eines Lackes (7);Entfernen der verbliebenen Schicht (2) zumindest im Bereich der beweglichen Struktur (3) derart, daß die bewegliche Struktur (3) nur noch von dem Lack (7) gegenüber dem feststehenden Bereich fixiert ist;Einbringen des Bauteils (9) in einen Rezipienten (11);Einführen eines Lösungsmittels in den Rezipienten (11) zum Entfernen des Lackes (7);Einführen einer Flüssigkeit, in der das Lösungsmittel löslich ist, in den Rezipienten (11);Erwärmen des Rezipienten (11) über die kritische Temperatur der Flüssigkeit, um diese in ihre gasförmige Phase zu überführen; undAblassen des Gases mit dem gelösten Lösungsmittel aus dem Rezipienten (11).
- Verfahren nach Anspruch 1, bei dem die Schicht (2) aus Siliziumdioxid besteht und bei dem der Schritt des teilweisen Freilegens der eingebetteten Struktur (3) das teilweise Wegätzen der Schicht (2) umfaßt.
- Verfahren nach Anspruch 1 oder 2, bei dem Lack ein Fotolack ist.
- Verfahren nach Anspruch 3, bei dem das Lösungsmittel ein organisches Lösungsmittel ist.
- Verfahren nach einem der Ansprüche 1 bis 4, bei dem die Flüssigkeit, die in die gasförmige Phase zu überführen ist, CO2 ist.
- Verfahren nach einem der Ansprüche 1 bis 4, bei dem die Flüssigkeit, die in die gasförmige Phase zu überführen ist, eine Halogen-Kohlenstoff-Verbindung ist.
- Verfahren nach Anspruch 6, bei dem die Halogen-Kohlenstoff-Verbindung Freon CClF3 ist.
- Verfahren nach einem der Ansprüche 1 bis 7, bei dem der Rezipient ein sogenannter Über-Kritischer-Punkt-Trockner (11) ist.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10151130 | 2001-10-17 | ||
| DE2001151130 DE10151130C1 (de) | 2001-10-17 | 2001-10-17 | Verfahren zum Herstellen eines mikromechanischen Bauelements mit einer beweglichen Struktur |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1304309A2 true EP1304309A2 (de) | 2003-04-23 |
| EP1304309A3 EP1304309A3 (de) | 2004-10-13 |
Family
ID=7702729
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP02022146A Withdrawn EP1304309A3 (de) | 2001-10-17 | 2002-10-02 | Verfahren zum Herstellen eines mikromechanischen Bauelements mit einer beweglichen Struktur |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP1304309A3 (de) |
| DE (1) | DE10151130C1 (de) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3025196B1 (de) * | 2013-07-25 | 2019-02-27 | Acquandas GmbH | Verfahren zur herstellung einer medizinischen vorrichtung oder einer vorrichtung mit strukturelementen, verfahren zum modifizieren der oberfläche einer medizinischen vorrichtung oder einer vorrichtung mit strukturelementen, medizinische vorrichtung und schichtverbund mit einem substrat |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19506404C1 (de) * | 1995-02-23 | 1996-03-14 | Siemens Ag | Verfahren zum Freiätzen (Separieren) und Trocknen mikromechanischer Komponenten |
| DE19600399C1 (de) * | 1996-01-08 | 1997-08-21 | Siemens Ag | Herstellverfahren für ein mikromechanisches Bauteil mit einer beweglichen Struktur |
-
2001
- 2001-10-17 DE DE2001151130 patent/DE10151130C1/de not_active Expired - Fee Related
-
2002
- 2002-10-02 EP EP02022146A patent/EP1304309A3/de not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3025196B1 (de) * | 2013-07-25 | 2019-02-27 | Acquandas GmbH | Verfahren zur herstellung einer medizinischen vorrichtung oder einer vorrichtung mit strukturelementen, verfahren zum modifizieren der oberfläche einer medizinischen vorrichtung oder einer vorrichtung mit strukturelementen, medizinische vorrichtung und schichtverbund mit einem substrat |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1304309A3 (de) | 2004-10-13 |
| DE10151130C1 (de) | 2003-02-13 |
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| RIC1 | Information provided on ipc code assigned before grant |
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